Russian opposition calls for more protests after mass arrests
Further action planned to press authorities to let candidates stand in Moscow city elections
Russian opposition politicians have called on their supporters to keep up with street rallies, the day after the most forceful police response to protests in the country for years.
More than 1,300 people were detained by police on Saturday, at a protest called in response to the refusal of electoral authorities to register independent candidates for the Moscow city council elections in September.